Starkey Hearing TechnologiesWidexSignia Hearing TechnologiesOticon - People FirstReSound - rediscover hearingPhonak - Life is onUnitron

Both PEFO 34561 and PEFO 34269 manage partial 2nd sacral backbone

Both PEFO 34561 and PEFO 34269 manage partial 2nd sacral backbone

5.6.4 Sacral vertebrae

Several separated sacral centra was indeed obtained (age.grams., PEFO 33875 and 33819), however the sacral rib and you will sensory arch is actually busted of. What number of sacral vertebrae is determined become several mainly based on: (a) one or two type of sacral rib markings toward ilia regarding Roentgen. callenderi; (b) several ankylosed centra (PEFO 36876) that have clear articulations to own ribs and you can neural arches (Data 8i–k); and (c) truth be told there seem to be just a couple morphologies regarding sacral backbone certainly the latest isolated specimens. The 2 ankylosed centra implies that particular specimens off Roentgen. callenderi could possibly get coossify the sacral spinal vertebrae and this that it profile is actually variable from inside the taxon. While the most of the specimens away from PFV 297 was out-of comparable proportions, so it coossification in some specimens doesn’t appear to be proportions related. Instead, once the into the ventral view the lateral expansions of one’s centra as much as the ankylosed area are not perfectly symmetric, which collection you will depict a great cystic and extra specimens are required to confirm this.

The fresh sacral centra try elongate and you may mediolaterally large than simply dorsoventrally high, plus the centrum faces was amphicoelous (Numbers 8i–k). Next sacral rib articulates with most of horizontal epidermis of centrum and you may a portion of the ventrolateral epidermis of sensory arch (PEFO 36876). Inside dorsal examine, the newest sacral rib of next sacral vertebra expands considerably into the an enthusiastic anteroposteriorly elongate articulation to the ilium (Shape 8l). Inside the horizontal view, which articulation skin was cigar-shaped; that it articulates with many of the period of new postacetabular techniques of the ilium. The newest anterior part of the articulation is actually slightly convex having a beneficial slight dorsomedial extension. The remainder black singles ziyaretГ§ileri articular skin is concave. This new articular surface of your centrum while the second sacral rib try rounded into the lateral examine (Contour 8k). An excellent transverse ridge separates the fresh new articular facial skin with the two parts, less region that fits to the a position into lateral section of the 2nd sacral centrum, and you can a higher region one articulates to the sensory arch. The latest sensory arc is not really-managed in just about any specimen; the prezygapophysis is actually built sixty° of lateral together with postzygapophysis are centered only 10° off horizontal (even if these are typically some surface).

The complete number of caudal spinal vertebrae within Roentgen. callenderi try unknown; but not, you will find at 34–36 caudal spinal vertebrae on aetosaurian A. ferratus (J.B. Desojo, private interaction, 2021), and you will an identical matter may have been found in the fresh aetosauriform R. callenderi (Shape seven; Nesbitt, 2011 ; ).

5.six.5 Prior and you can mid-caudal spinal vertebrae

Prior caudal backbone (Contour 8m) provides hourglass-molded centra in ventral consider that are anteroposteriorly longer than mediolaterally greater and you can profoundly grooved ventrally (e.grams., PEFO 34561). That it groove develops at anterior and you can posterior finishes in fact it is marked by collection of ridges. The fresh anterior end merges with several posteriorly inclined confronts, and that act as the new articulation counters with the chevrons. These vary from the fresh link-such as for example chevron aspects of certain rauisuchids (e.g., UCMP 124890; Much time & Murry, 1995 : fig. 130c). Just like the anteriormost caudal vertebra isn’t preserved, this is not clear at which position the chevrons initiate. New articular face is actually bullet and you can amphicoelous which have evident rims. The newest sensory arch is actually lowest, or around 1 / 2 of new height of one’s centrum articular deal with. Brand new prezygapophysis try really-establish developing a posteroventrally, and you will medially centered flat articular facial skin. New distal margins of one another prezygapophyses blend along with her and so are confluent towards anterior edge of the new sensory back. Brand new spine is anteroposteriorly greater that have a straight posterior border and an anteroventrally slanting anterior line. New apex is not longer into a proper-set up back dining table. The fresh new postzygapophysis is much large (approximately twice the brand new peak) compared to the prezygapophysis. Its lateral margin is virtually upright, and articular facial skin was inclined ventromedially regarding the 45° and faces quite posteriorly.

The following two tabs change content below.

Daniel Petraglia

Latest posts by Daniel Petraglia (see all)